| Code | Name | Region |
|---|---|---|
| MXATO | Atotonilco El Alto | JAL |
| MXAQL | Atotonilquillo | JAL |
| MXAYC | Atoyac | JAL |
| MXABB | Atunes | MIC |
| MXMDE | Amatlan De Los Reyes | VER |
| MXADB | Amealco De Bonfil | QUE |
| MXAME | Ameca | JAL |
| MXAMC | Amozoc De Mota | PUE |
| MXANA | Anahuac | CHH |
| MXAAC | Angel Albino Corzo | CHP |
| MXAOE | Antonio Escobedo | JAL |
| MXATZ | Antunez | MIC |
| MXAPN | Apan | HID |
| MXAPO | Apaseo | ZAC |
| MXAEA | Apaseo El Alto | GUA |
| MXAPA | Apaseo El Grande | GUA |
| MXAZG | Apatzingan | |
| MXAPX | Apaxco De Ocampo | MEX |
| MXAZP | Apazapan | VER |
| MXAPI | Apizaco | TLA |
| MXAPD | Apodaca | |
| MXAMB | Aramberri | NLE |
| MXARA | Arandas | JAL |
| MXARC | Arcelia | GRO |
| MXAGD | Agua Dulce | BCN |
| MXAPR | Agua Prieta | SON |
| MXAGU | Aguascalientes | AGU |
| MXAHM | Ahome | SIN |
| MXAH5 | Ahualulco | SLP |
| MXJHT | Ahuatepec | MOR |
| MXAXT | Ahuazotepec | HID |
| MXAHU | Ahumada | CHH |
| MXQMX | Ajuchitlan | QUE |
| MXAKI | Akil | YUC |
| MXALO | Alamo | VER |
| MXALD | Aldama | TAM |
| MXALF | Alfajayucan | HID |
| MXALL | Allende | NLE |
| MXADJ | Almoloya De Juarez | MEX |
| MXATM | Altamira | TAM |
| MXAVD | Alvarado | VER |
| MXAOB | Alvaro Obregon | |
| MXAMZ | Amacuzac | MOR |
| MXATN | Amatitan | JAL |
| MXAJS | Abreojos | |
| MXACE | Acajete | PUE |
| MXJJT | Acajete | VER |
| MXACB | Acambaro | GUA |
| MXANH | Acanceh | YUC |
| MXACP | Acaponeta | NAY |